本文選題：儲液罐　切入點(diǎn)：罐周不均勻沉降　出處：《浙江大學(xué)》2015年碩士論文

【摘要】：立式圓筒形鋼制儲罐通常由頂蓋、罐壁、底板以及附件組成,廣泛應(yīng)用于氣體、液體和固體的儲存。為了便于運(yùn)輸和裝卸,大多數(shù)儲罐建造在沿海沿江地區(qū),由于地基承載力小,儲罐通常會出現(xiàn)不同程度的沉降變形,其中罐周的不均勻沉降對儲罐的影響最為不利。本文將采用有限元數(shù)值模擬方法,針對在役儲液罐在實(shí)測罐周不均勻沉降下的應(yīng)力和變形開展研究,提出一種新的沉降數(shù)據(jù)處理方法,探討儲液高度對罐周不均勻沉降儲液罐變形量的影響。主要工作如下：(1)針對國內(nèi)外對罐周不均勻沉降數(shù)據(jù)處理方法的不足,提出了一種新的罐周不均勻沉降曲線擬合方法；同時(shí)結(jié)合儲液罐實(shí)測沉降案例,應(yīng)用罐周不均勻曲線擬合方法對其沉降數(shù)據(jù)進(jìn)行處理,發(fā)現(xiàn)擬合效果較好。(2)探討罐周不均勻沉降函數(shù)形式對變壁厚鋼制儲罐變形量的影響。分別計(jì)算了正弦諧波沉降函數(shù)和余弦諧波沉降函數(shù)下儲罐罐壁應(yīng)力并進(jìn)行線性疊加,其結(jié)果與不均勻沉降函數(shù)下儲罐罐壁應(yīng)力值進(jìn)行比較并計(jì)算兩者間的相對誤差；同樣計(jì)算得到罐壁徑向位移的相對誤差。研究發(fā)現(xiàn),隨著諧波沉降幅值的增大,罐壁應(yīng)力和徑向位移的相對誤差均呈現(xiàn)逐漸增大的趨勢；隨著諧波階數(shù)的增大,罐壁徑向位移的相對誤差呈現(xiàn)先增大后減小的趨勢,而應(yīng)力的相對誤差影響規(guī)律不明顯。(3)分析儲液高度對罐周不均勻沉降下儲液罐變形量的影響。計(jì)算了不同儲液高度下,發(fā)生罐周不均勻沉降儲液罐的Mises應(yīng)力和徑向位移,比較得到了隨著儲液高度變化Mises應(yīng)力和徑向位移的變化趨勢；并以一個(gè)固頂罐和一個(gè)浮頂罐作為計(jì)算案例開展分析。研究發(fā)現(xiàn),隨著儲液高度的降低,罐壁的Mises應(yīng)力最大值呈現(xiàn)先減小后基本不變的趨勢；對于浮頂罐,儲液高度對其徑向位移的影響很小,可以忽略；而對于固頂罐,只有當(dāng)儲液高度較高時(shí),才需要考慮儲液高度對其徑向位移的影響。(4)提出了儲罐在罐周不均勻沉降下的屈曲分析方法,并運(yùn)用該方法,分析了固頂罐和浮頂罐在實(shí)測罐周不均勻沉降下的屈曲行為。結(jié)果表明,采用該方法可以在確保罐周不均勻沉降載荷完全加載的前提下,減少計(jì)算成本,為儲罐的屈曲分析提供參考依據(jù)。
[Abstract]:Vertical cylindrical steel storage tanks are usually made up of top caps, tank walls, bottom plates and accessories. They are widely used in gas, liquid and solid storage.In order to facilitate transportation and loading and unloading, most storage tanks are built in the coastal areas along the Yangtze River. Due to the small bearing capacity of the foundation, the tanks usually have different degrees of settlement deformation, among which the uneven settlement around the tanks is the most unfavorable to the storage tanks.In this paper, the finite element numerical simulation method is used to study the stress and deformation of in-service liquid storage tanks under the measured non-uniform settlement around the tank, and a new settlement data processing method is proposed.The effect of liquid storage height on the deformation of tank with uneven settlement around the tank was discussed.The main work is as follows: (1) aiming at the shortage of the domestic and foreign data processing methods for the non-uniform settlement around the tank, a new fitting method of the non-uniform settlement curve around the tank is proposed, and the case of the actual settlement of the liquid storage tank is combined with the method of fitting the curve of the non-uniform settlement around the tank.This paper deals with the settlement data by using the inhomogeneous curve fitting method of the tank circumference, and finds that the fitting effect is good.) the influence of the non-uniform settlement function on the deformation of the steel storage tank with variable wall thickness is discussed.The tank wall stress under sinusoidal harmonic settlement function and cosine harmonic settlement function is calculated and linear superimposed. The results are compared with the tank wall stress values under non-uniform settlement function and the relative errors between the two are calculated.The relative error of radial displacement of tank wall is also calculated.It is found that with the increase of harmonic settlement amplitude, the relative error of wall stress and radial displacement increases gradually, and with the increase of harmonic order, the relative error of radial displacement of tank wall increases first and then decreases.However, the relative error of stress is not obvious.) the influence of liquid storage height on the deformation of the tank under uneven settlement around the tank is analyzed.The Mises stress and radial displacement of the tank with different liquid storage heights are calculated, and the variation trends of Mises stress and radial displacement with the change of liquid storage height are compared.A fixed roof tank and a floating roof tank are taken as calculation cases.It is found that with the decrease of liquid storage height, the maximum Mises stress of the tank wall decreases first and then remains unchanged; for floating roof tank, the effect of liquid storage height on its radial displacement is negligible, but for the fixed top tank, the effect of liquid storage height on the radial displacement of the tank is negligible.Only when the liquid storage height is high, the influence of liquid storage height on its radial displacement should be considered. (4) the buckling analysis method of the tank under uneven settlement around the tank is put forward, and the method is used.The buckling behavior of fixed roof tank and floating roof tank under the measured non-uniform settlement around the tank was analyzed.The results show that this method can reduce the calculation cost and provide a reference for the buckling analysis of the tank under the premise of ensuring the complete loading of the non-uniform settlement load around the tank.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE972

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本文編號：1729892